1.has a hot water connection
A hot water connection means that you can provide the machine with hot water from your main hot water supply. This can be faster than an internal heater and can save money if you have a cheap and efficient water heater.
2.has top energy efficiency rating
The appliance is either Energy Star Certified, or has an EU energy efficiency rating of A++ or A+++. This means it consumes around 20-30% less energy than is required by the minimum local standards for energy efficiency.
3.has a direct drive motor
A direct drive motor has no belt and pulley. This means it wastes less power in friction, are less prone to breakdowns and have longer lifetimes in general. They are able to operate more quietly and with less vibration.
The height represents the vertical dimension of the product. We consider a smaller height better because it assures easy maneuverability.
Aqua stop machines have a special mechanical system which cuts off the water flow into the tub if a fault occurs with the inlet pipe.
We consider a thinner chassis better because it makes the product more compact and portable. Thinness is a feature highlighted by many manufacturers of mobile devices, but it is essential for a wide range of products.